I'm certain that the game would require an update anyway because new menus etc will be needed to be added, new icons, the tracks themselves and so on. So that explains the 2.0 update.
I know game updates can be applied via specific update.NSP files, and a lot of games like Breath of the wild, Smash Bros and more have DLC NSPs that need to be installed to 'unlock' or access the DLC that the update adds if you know what I mean.
Basically, I'm asking how to get the DLC courses on a hacked switch
thanks to anyone that can help!